The feedback circuit of Fig. P7.28 uses a CMOS op amp to implement a current amplifi er with iO 5 100iI for iI $ 0. The open-loop characteristics of the op amp are ri 5 `, ro 5 100 kV, and av 5 104...

The feedback circuit of Fig. P7.28 uses a CMOS op amp to implement a current amplifi er with iO 5 100iI for iI $ 0. The open-loop characteristics of the op amp are ri 5 `, ro 5 100 kV, and av 5 104 V/V, and to make up for the relatively high value of ro, we buffer the op amp with a pMOSFET booster, as shown. Assuming the FET has k 5 0.5 mA/V2 ,


5 0.05 V21 , and 5 0.1, use the shunt-series procedure to estimate Ri , Ro, and the unloaded gain Asc 5 iOyiI at iI 5 10 A.